[TenTec] Narrow signal on 28.027620 MHz

[Ken Brown]

> It does not go away; same signal strength (I'd give it about a 7 on our 
> RST scale).
>   
> I don't know how to add attenuation at the antenna; are these the step 
> attenuators I've seen that some QRP operators use to reduce their output 
> power?
>   
Since it does not go away when you disconnect the antenna, adding 
attenuation to the antenna port is not going to tell us anything. The 
signal is something generated within the receiver. It is either the 
product of the mixture of oscillators and clocks all generated inside 
the receiver, or it is possible that there is something getting in on 
another lead, such as the power leads, data connection or audio 
connections. I'm inclined to believe it is all from within the receiver 
and no outside signals are involved. With a system as complex as the 
Orion, it is possible that to duplicate it on another Orion almost every 
single setting would have to be identical. Maybe the fellow who cannot 
hear it on his Orion has some setting completely different from you, 
resulting in one of the necessary component oscillators or clocks not 
being on the same frequency as in your Orion. What about the local 
oscillator in the auxiliary receiver? Maybe he habitually leaves his on 
a WWV frequency and you habitually leave yours on some other frequency.
> I am going to try turning off other electrical gear near the transceiver 
> (computer, principally) and see if that makes a difference.
>
>   
Good idea. And in addition to turning things off, disconnect as much 
stuff from the rig as possible.

DE N6KB